I run optimized apps from the Lunatics folks. I've not had a problem with SIGSEGV. However the optimized apps also don't run the screensaver. So a simpler solution would seem to be not to use the screensaver since as we do know the screensaver does tend to slow processing down a bitIn a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

Thank you for your replies. It sounds reasonable that this issue is somehow related to the screensaver: I'm running the tasks on a headless linux virtual root server. Is it possible to look into this by someone of the development team? Meanwhile I've deactivated Astropule tasks.